feat: connect WS events to mascot expression triggers

Add MascotExpressionSync component to dashboard layout that listens for message_created (flagged/warn triggers surprise expression) and voice_active_user (triggers listening expression) events.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

services/frontend/src/app/(dashboard)/layout.tsx

@@ -1,16 +1,15 @@
 "use client";
 
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
-import { Suspense } from "react";
+import { Suspense, useEffect, useState } from "react";
 import { TopNav } from "@/components/layout/top-nav";
 import { MobileNav } from "@/components/layout/mobile-nav";
-import { WsProvider } from "@/lib/ws/context";
+import { WsProvider, useWebSocket } from "@/lib/ws/context";
-import { MascotProvider } from "@/components/mascot/mascot-context";
+import { MascotProvider, useMascot } from "@/components/mascot/mascot-context";
 import { MascotContainer } from "@/components/mascot/mascot-container";
 import { MiniPlayer } from "@/components/media/mini-player";
 import { MediaPlayerProvider } from "@/lib/hooks/use-media-player";
 import { HiddenSidebar } from "@/components/layout/hidden-sidebar";
-import { useState } from "react";
 
 const queryClient = new QueryClient({
   defaultOptions: {
@@ -22,6 +21,31 @@ const queryClient = new QueryClient({
   },
 });
 
+function MascotExpressionSync() {
+  const ws = useWebSocket();
+  const { setExpression } = useMascot();
+
+  useEffect(() => {
+    const unsub1 = ws.on("message_created", (data: any) => {
+      if (data.ai_status === "flagged" || data.ai_status === "warn") {
+        setExpression("surprise");
+        setTimeout(() => setExpression("idle"), 2000);
+      }
+    });
+
+    const unsub2 = ws.on("voice_active_user", () => {
+      setExpression("listening");
+    });
+
+    return () => {
+      unsub1();
+      unsub2();
+    };
+  }, [ws, setExpression]);
+
+  return null;
+}
+
 export default function DashboardLayout({
   children,
 }: {
@@ -34,6 +58,7 @@ export default function DashboardLayout({
       <WsProvider>
         <MediaPlayerProvider>
           <MascotProvider>
+            <MascotExpressionSync />
             <div className="min-h-screen bg-canvas">
               <TopNav />
               <HiddenSidebar guildId={guildId} onGuildChange={(g) => setGuildId(g ?? "")} />